Dental appliance.



No. 652,404. Patented .Iune 26, !900. L. G: SHAF'P;`

DENTAL APPLlANCE.

(Applicaflon med Oct. 17, 1599. (No Model.)

LEE C. SHARP, OF OMAHA, NEBRASKA.

DENTAL APPLIANCE,

SPECIFICATION form'ng part of Letters Patent No. 652,404, dated June 26, 1900. Application filed October 17, 1899; Serial No. '733,869. (No model.)

To all whom it may conocrn:

Be it known that I, LEE C. SHARP, residing at Omaha, in the county of Douglas and State of Nebraska, have invented certain useful Improvements in Dental Appliances; and I do hereby declare that the following is a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, which form a part of this specification.

This inventon relates to an improvement in dental appliances by neans of which a pair of forceps may be gradually opened or ex,- panded and held under force, as will' be described more fully hereinafter.

In the accompanying drawings I have shown in Figure 1 a side elevation of a pair of forceps provided with my improvement, while Fig.-2 shows an enlarged detached detail of the power mechanism used in my invention.

The aim of my invention is more particularly to provide dentists pliers with a power nechanism, so that the forceps may be opened under power and held at any point.

In the furtherance of the object of my in- Vention I provide an ordinary pair of forceps P, having suitable jaws, with a toggle system in the form of two similar ears 9, which by means of suitable pins x are pivotally secured to the handles of the pliers, as is shown in Fig. 1. These ears 9 in turn are provided with the pins 13 and 14. To one ear are secured the bars 2 and 2' and 3 and 3', as is shown more clearly in Fig. 2. To the bars 2 2' and 3 3 are next secured the bearings 10 and 11, the bearing 10 being in the form of a trunnion having the projecting pins 15 and the bearing ll having the projecting trunnions 12, by means of which trunnions the bearings are secured to the bars 2 2', 4 4', 3 3', and 5 5', the bearing ll being adapted to loosely receive the stern 6 of an adjustingscrew, while the bearing 10 is threaded so that this screw 6 may wind through the same. The counterpart ear 9 is provided with a pin 14 to be united to the bars t 4' and 5 5', so

that as the handles of the forceps are opened outward the bars 2 2' and 4: 4:' are brought nearer to the bars 3 3' and 5 5', the bearing 15 being carried rearward-that is, away from the jaws -which movement also carries forward the screw 6, while the bearing ll is carried forward toward the jaws, this bearing rapidly working over the screw 6, so that these pliers can be used as any ordinary pliers can,

as the, toggle mechanism in no way affects the use of the pliers when they are used to grasp sonething between the jaws, while when they are made to hold something by inserting the jaws J into an opening these jaws maybe eXpanded under power to bind. within the opening or ring into which the jaws are inserted and not only held there under power, but the jaws may be used as formers in working the screw 6 by means of the lover 7, by means of which a slow but very powerful force is eXerted upon the handles of the pliers to open the jaws. To quickly Carry back the screw after the jaws have been opened, it is simply necessary for the operator to grasp the stern 8 to rapidly revolve the screw 6.

In Operating the screw 6 the head works against the rear bearing 11 to force the bars 3 and 5 toward the jaws, while the screw 6 feeds the bearing 10 toward the rear end of the forceps or toward the head z in forcing outward the handles of the pliers.

Having thus described my said nvention, what I claim as new, and desire to secure by United States Letters Patent, is-

1. The combination with a pair of pliers, of two sets of toggle-bars Secured to and uniting the handles of the pliers, a threaded bearing removable at the union of one set of toggle-bars, and a second free bearing at the union of the second set of toggle-bars, and a threaded screw adapted to freely work through said bearing and threading into said threaded bearing as and for the purpose'set forth.

2. The combination with a pair of pliers of the following instrunentalities, to Wit: the ears 9, 9, pivotally secured to the handles of said pliers, the pins 13, and 14 Secured to said cars 9, 9, the bars 2 'and 3 extending from said pin 13, the bars 4 and 5 extending from said pin let, the threaded trunnion-bearing 10 uniting said bars 2 and 41, the hollow trunnion-bearing 11 uniting said bars. 3 and 5, and the threaded screw 6 loosely passing through said trunnion-bearing 11 and threading into said trunnion-bearing 10, as and for the purpose set forth.

Signed in the presence of two witnesses.

LEE O. SI-IARP.

-Witnesses:

MABEL A. DODSWORTH, CLEMENT F., PATTERSON.

IOO 

